ENATIONAL
GEOGRAPHIC
MAGAZINE
AUGUST, 1921
CONTENTS
The Wild Life of Lake Superior,
Past and Present
GEORGE SHIRAS, 3d
With Frontispiece and 75 Additional Illustrations
Protecting the United States from Plant
Pests
With 16 Illustrations
CHARLES LESTER MARLATT
PUBLISHED BY THE
NATIONAL GEOGRAPHIC SOCIETY
HUBBARD MEMORIAL HALL
WASHINGTON,
D.C.